HighT increases Sex Drive & Libido, Increase Strength & Stamina, Increase Energy & Vitality. In a man's brain, there is a complex chain of signals called the hypothalamic-pituitary-gonadal axis. The Testosterone produced in the testes is regulated by this chain. At the onset of puberty, there is a rapid increase in the production of Testosterone. But just as rapidly as it increases at puberty, Testosterone production begins to slow from the age of 30 onwards. HighT has been clinically proven to boost free Testosterone levels leading to increased sexual libido, muscle mass and energy levels.